<template>
  <header class="header">
      <h1>todos</h1>
      <input class="new-todo" placeholder="请输入任务名称" autofocus 
      v-model.trim="taskName"
      @keydown.enter="addTask"
      />
    </header>

</template>

<script>
export default {
  name: 'TodoHeader',

  data() {
    return {
      taskName:''
    };
  },
  methods: {
    addTask(){
      if(this.taskName.length===0) return alert('请输入内容！')
      this.$emit('addTask',this.taskName)
      this.taskName=''
    }
  },
};
</script>

<style lang="scss" scoped>

</style>